Process for loading or impregnating silk and silk-tissue



Patented Dec. 8, 1931 UNITED STATES MARKUS WERDER, OFIRIEDLINGEN-LEOPOLDSHOHE IN BADEN, GERMANY miocnss For; LOADING onmrane'na'rme SILK am) SILK-TISSUE No Drawing.- 4pplication filed July 9,199 8, Serial No. 281,488, and in Germany Kay 8, 1928.

For the purpose of charging or loading silk and silk-tissues it is knownto treat the same several times in succession with a solution containingchiefly stannic tetrachloride,

6 the so-called pink-bath, and subsequently with a solution containingmainly secondary phosphate of sodium or di-sodium phosphate.

Immediately upon having been treated with stannic tetra-chloride asabove stated the material is subjected to-a thorough and exhaustivewashing and cleaning process.

account of the repeated treatments with solutions of tin-tetrachloride,a great part of which is washed in the washing water and 5 can only berecovered by very expansive processes. A further objection resides inthe fact, that the exhaustive. washing process, to which the material issubjected immediately after the treatment with tin-chloride-bath,

3 involves considerable cost.

The object of my invention is to remedy these defects. With this objectin view I first treat the silk material. with a solution oftin-tetrachloride as usual and immediately thereupon, after havingremoved the excessive stannic chloride from the wet material by shakingor squeezing, I subject the latter to the action of an acid solution ofammonium phosphate, preferably mono-ammonium phosphate. 1

In proceeding in this manner I surprisingly found that it is possible toattain in this way a comparatively high loading result or in other wordsto ensure any desired loading effect by way of a less number of tin andphosphate treatments than hitherto required for obtaining the sameeffect. It will be seen that a marked economy of work, time andchemicals is secured thereby and besides that 9 a further considerableeconomical advantage resides in the fact that the expensiverecovery oftin salts from the washing water is (llS-t pensed w th; anotheradvantage of the invent1on hes in the fact that there is no necessity ofemploying protective colloids, which must it! be used with the knownmethods. Separatlons or precipitations in the final product do notoccur; gloss and all of the other valuable properties of the silk arefully preserved therein.

The concentration of the tin-bath is preferably between 24and 30 B.,while the acid phosphate bath or solution preferably contams 10 to 12percent of mono-ammonium phosphate and may be applied in a cold state.

In connection with the improved process above outlined in general, thesilk material 1s SllbJGCtGd to a subsequent treatment with (ii-sodiumphosphate, which is known in itself, contamlng about 12 to 16 percentand at a temperature of about to C.

If desired the method according to the present invention may be combinedwith any other known loading methods. The d1- sodlum-phosphate may bereplaced by soda ust 1n accordance with the loadingde ee desired to beattained in the final pro not and it goes wlthout mentioning that themethod may be combined with the usual final step of treatmg the productwith waterglass or even with a solution or bath of sulphate of aluminiumprevious to such waterglass treatment. 7

I shall-now proceed to describe the successive step of my invention morein detail by way of a few specific examples.

Ewample 1,-v-A. tintetrachloride-bath of 28 B.,

Shaking or squeezing of the material,

A cold mono-ammonium phosphate bath containing 12 percent ofmonorammonium phosphate and 1 percent of phosphoric acid,

A di-sodium-phosphate bath containing 15 percent of di-sodium phosphateand heated to a temperature of 60 C.,

Simple washing and shakingof the treated material under treatment.

Ewample .'Z.A tintetrachloride-bath of Shaking or squeezing of thematerial under treatment,

A cold bath containing 12 percent monoammonium phosphate,

A (ii-sodium phosphate-bath containing 15 percent of di-sodium phosphateand heated. to a temperature of 60 0., i

Washing and shaking of the treated material.

Example 3.The steps as in Example 1 or Example 2 and subsequently A bathof waterglass of'the usual tration of about 50 B.,

Washing and shaking, soaping, dyeing.

concen- 5 A loading efiect of 80-40% is obtained by this treatment. Ifit is desired to have a loading effect, for instance, of 85 to 95% thedescribed treatments must be repeated three times.

What I claim is:

1. A process of impre tissues with chemical su stances for the pur poseof increasing the weight thereof, con- 7 si'sting in first treatingthematerial in the usual manner with a tinchloride solution andimmediately thereafter with an acid solution of ammonium phosphate;

- 2; A process of impregnating silk and silk tissues with chemicalsubstances for the purpose of increasing the weight thereof, consistingin first applying the usual treatment with a tinchloride solution andimmediately thereafter treating the material with a solution ofmono-ammonium phosphate.

3. A process of impregnating silk and silktissues with chemicalsubstances for the purpose of increasing the weight thereof consistingin first treatin the material with the usual tinchlorideath andthereupon treating the material with an acid solution of ammoniumphosphate and finally removing excessive liquid therefrom.

4. A process of treating silk and silk-tissues with chemical substancesfor the purpose of increasing the weight thereof which comprises firsttreating the silk material with a solution of stannic chloride, thenremoving excessive 1i uid therefrom by shaking and squeezing, t ereupontreating the still Wet material withan acid solution of ammoniumphosphate and finally treating the same with a solution ofdi-sodium-phosphate.

In testimony whereof I aflix my signature. DR. MARKUS WERDER.

asaeao ating silk and silk-

